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1> ## Documentation Index
2> Fetch the complete documentation index at: https://code.claude.com/docs/llms.txt
3> Use this file to discover all available pages before exploring further.
4
5# Week 22 · May 25–29, 2026
6
7> Run Claude Code on Claude Opus 4.8, orchestrate large tasks with dynamic workflows, catch security issues with the security-guidance plugin, and use fast mode on Opus 4.8 at a lower price.
8
9Releases [v2.1.150 → v2.1.157](https://code.claude.com/docs/en/changelog.md#2-1-150)
104 features · May 25–29
11
12Claude Opus 4.8
13new model
14
15Opus 4.8 is now the default on Max, Team Premium, Enterprise pay-as-you-go, and the Anthropic API. It defaults to high effort; use `/effort xhigh` for harder tasks. Requires v2.1.154 or later.
16
17<video autoPlay muted loop playsInline src="https://mintcdn.com/claude-code/QsIrGXGFg6xd7joy/images/whats-new/opus-4-8.mp4?fit=max&auto=format&n=QsIrGXGFg6xd7joy&q=85&s=6ebcf5fe136467da2b254de1fe749ea7" />
18
19Switch to Opus 4.8 by name, or pick it from the model picker:
20
21```text title="Claude Code" wrap theme={null}
22/model claude-opus-4-8
23```
24
25[Model configuration](https://code.claude.com/docs/en/model-config.md#available-models)
26
27Dynamic workflows
28research preview
29
30A workflow is an orchestration script Claude writes for your task and runs across many subagents in the background. Use one when a task is too large for one conversation to coordinate: a codebase-wide audit, a large migration, a research question that needs cross-checking. Manage runs with `/workflows`.
31
32
33
34Describe the task and ask for a workflow:
35
36```text title="Claude Code" wrap theme={null}
37create a workflow that migrates every internal fetch() call to the new HttpClient wrapper
38```
39
40[Dynamic workflows](https://code.claude.com/docs/en/workflows.md)
41
42Security guidance plugin
43plugin
44
45The security-guidance plugin reviews Claude's code changes for vulnerabilities and fixes them in the same session. It runs a fast pattern check on each edit, a model review at the end of each turn, and a deeper agentic review on commit or push. Add project rules in `.claude/claude-security-guidance.md`.
46
47<video autoPlay muted loop playsInline src="https://mintcdn.com/claude-code/QsIrGXGFg6xd7joy/images/whats-new/security-guidance.mp4?fit=max&auto=format&n=QsIrGXGFg6xd7joy&q=85&s=c91d865936411586f42b24c558bcdd1d" />
48
49Install it from the official Anthropic marketplace:
50
51```text title="Claude Code" wrap theme={null}
52/plugin install security-guidance@claude-plugins-official
53```
54
55Then activate it in the current session:
56
57```text title="Claude Code" wrap theme={null}
58/reload-plugins
59```
60
61[Security guidance plugin](https://code.claude.com/docs/en/security-guidance.md)
62
63Fast mode on Opus 4.8
64research preview
65
66Fast mode now defaults to Opus 4.8 at \$10/\$50 per MTok: 2x the standard rate for about 2.5x the speed. Opus 4.7 and 4.6 stay at \$30/\$150. Opus 4.6 fast mode is deprecated.
67
68Toggle fast mode, now on Opus 4.8:
69
70```text title="Claude Code" wrap theme={null}
71/fast
72```
73
74[Fast mode pricing](https://code.claude.com/docs/en/fast-mode.md#understand-the-cost-tradeoff)
75
76Other wins
77
78In `claude agents`, prefix a shell command with `!` to run it as a background job you can attach to and detach from; also available as `claude --bg --exec 'pytest -x'`Plugins in `.claude/skills` directories are now loaded automatically, no marketplace required, and `claude plugin init <name>` scaffolds a new pluginNew `/reload-skills` command re-scans skill directories without restarting, and `SessionStart` hooks can return `reloadSkills: true` to make skills they install available in the same sessionSkills and commands can set `disallowed-tools` in frontmatter to remove tools from the model while the skill is activeNew `MessageDisplay` hook event lets hooks transform or hide assistant message text as it is displayedClaude Code now switches to your configured `--fallback-model` for the rest of the session when the primary model is not found, instead of failing every requestPlugins can declare `defaultEnabled: false` in `plugin.json` or a marketplace entry, so they install without turning on until you enable themVim mode: `/` in NORMAL mode opens reverse history search, matching Bash and Zsh vi-modeStreaming tool execution is now always enabled, including with telemetry disabled and on Amazon Bedrock, Google Cloud's Agent Platform, and Microsoft Foundry`←←` to open the agents view now works on Amazon Bedrock, Google Cloud's Agent Platform, Microsoft Foundry, and with telemetry disabledClaude in Chrome: pick which connected browser to use via `/chrome` → "Select browser…", or in-chat when a browser action runs with multiple connected`claude mcp list` and `claude mcp get` now show unapproved `.mcp.json` servers as pending approval instead of auto-approving and connecting when output is piped
79
80[Full changelog for v2.1.150–v2.1.157 →](https://code.claude.com/docs/en/changelog.md#2-1-150)